remove some dead code

lib/utils/mu-str.h

@@ -174,19 +174,6 @@ GSList* mu_str_to_list (const char *str, char sepa, gboolean strip);
  */
 GSList* mu_str_esc_to_list (const char *str);
 
-/**
- * Parse a list of <key>:<value> arguments, where <value> supports
- * quoting and escaping.
- *
- * @param args a list of arguments
- * @param err receives error information
- *
- * @return a hash table with key->value, or NULL in case of
- * error. Free with g_hash_table_destroy.
- */
-GHashTable* mu_str_parse_arglist (const char *args, GError **err)
-G_GNUC_WARN_UNUSED_RESULT;
-
 /**
  * free a GSList consisting of allocated strings
  *